Improvement in the manufacture of globe-holders



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Manu|facuu"eV nf Globe-Holders.

' No. 143,656. Patented ocr. 14,1873.

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` V nl C. HENRY BARNEY, OF PROVIDENCE, RHODE ISLAND, ASSIGN OR TO GEORGEMOONEY AND JAMES SHAW, JR., OF SAME PLACE.

IMPROVEMENT IN THE WIANUFACTURE OF GLOBE-HOLDERS.

Specification forming part of Letters Patent No. 143,656, dated October14, 1873 application filed June 23, 1873.

To all whom 'it may concern:

Be it known that I, O. HENRY BARNEY, of the city and county ofProvidence and State of Rhode Island, have invented certain Im radialarms, and a central plate which is provided with an eye forattachment tothe ixture beneath a burner which secures the holder to the fixture.

Such holders prior to my invention have. either been made of cast metalin the properA form, or each of the arms withv a segmental portion ofthe plate has been cut singly from sheet metal in dies,-and connectedtogether by means of rivets and a iiat ring at the center. Holders for asimilar purpose, but of a somewhat different form, have also been cutirom thin sheet metal, and then struck up in shaping-dies into a formapproximating to al bowl shape. This style of holder in order to have asmuch strength as it is possible to attain with the thin metal, is notonly composed of the central plate with its eye and the several radialarms, but also with a ring at the outer ends o f the arms, and said ringconstitutes the receptacle for the neck of the globe'which it isintended to support. .Owing to the fact that the thin sheet metalbecomes attenuated and weakened to a marked degree in causing` it toassume the bowl shape, and also owing to the fact that the metal must beoriginally quite thin to admit of its being practically worked in thismanner, it is difficult to give to the arms sufficient length tomaintain ythe globe at a desired height above the base of the burner.Moreover, unless the large circumferential ring be employed therewith,the

thin metal cannot practically be made available, as the ring serves as abrace for the arms, and it is also essential, if the thin sheet metal beused, that considerable width be given to the arms in order that theymay be sufficiently strong. The downward rays of light should, however,be obstructed as little as possible, and certain classes of globe orshade-the opal, for .instanceshould be set with their bases nearly ashigh as the top of the burner.

In casting holders having only the central plate and the radial armsexcessive waste is incurred from imperfect fiowin g of the metal, and,requiring, as they do, considerable subsequent iinishing to render themacceptable to the trade, are produced only at objectionable cost.Economy is even attained in making them of sheet metal with the severalarms separate and riveted to a central liattened ring; and my inventionhas for its object the production of such holders, with great economy inlabor and metal, by cutting them in one piece from heavy sheet metal;and it consists in cutting the same from the sheet in blanks of apeculiar shape, which, while they approximate when cutvbut slightly totheir ultimate form, can readily, by simple bending, be made intoperfect holders. lBut more particularly to describe my invention I will.refer to the accompanying drawings, in which- Figure l represents one ofmy improved holders. Fig. 2 represents a holder composed of a centralflat ring and three radial arms,

which are riveted to the ring. Fig. 3 represents a blank for making athree-armed holder. Fig. 4 represents a blank for making a fourarmedholder. Fig. 5 represents dies for cutting' the three-armed blanks. Fig.6 represents a three-armed holder-blank straightenedA out. Fig. 7'illustrates the advantages which accrue from cutting the blank of mynovel form, as compared with cutting them in the form as shown in Fig.6. Fig. S represents bendingdies for giving to the parallel arms oftheblank the proper radiation at the hands of the unskilled operator. Fig.9 represents formers for bending the arms radially.

It will be readily comprehended that the scrap-waste, resulting from thecutting of blanks in the form represented in Fig. 6, would render theholders so made quite as expensive as those which were cast, and it willalso be as readily comprehended that by cutting the blanks withtheseveral arms on parallel lines, as illustrated in Fig. 7 that allobjectionable waste in scrap is practically' obviated, or at least thatthe said waste is reduced to a minimum. A fair comparison of the economyin 2 Maese metal can be made by placing three flattened holders, likethe one shown in Fig. .6, in as close proximity as would be practicableon a sheet of metal, and then marking a circumferential line around themas large as the space they occupy will permit. The unused metal wouldconstitute by far the greater proportion thereof. On the other hand, byapplying my method, at least nine holders could be cut from the samepiece, and if the metal be in straight wide strips as it comes from therolls, the ratio will be increased still further to nearly as eleven isto three.

In Fig. 7 it will be seen that should fourarnied holders be desired thesame novel principle is involved, and approximately economical resultsattained.

In order to place the outward bending of the two parallel arms of theblanks within the power of an unskilled operative, I can employ aholding and shaping die and formers, as illustrated in Figs. 8 and 9, inwhich A denotes the holding and shaping die. It is composed of twosections, which have corresponding` recesses, as shown at a, forreceiving the blank with the single arm, occupying` the rectangularrecess at b.

The operator drops the blank into the die, as indicated in Fig. 8, and,with the former B and a mallet, at one light blow makes the preliminaryradiation, and with the former C completes the operation.

The width of the recess a is so near the' thickness of the metal usedthat the arms cannot leave the plane they originally occupied.

Being made in two sections or halves, as shown, the bending-dies can beadjusted to any desired thickness of metal by inserting between theircoincident faces thin strips of metal, and turning the connecting-boltsso as to firmly bind the two sections together. The subsequent bendinginto the cup-like form is readily accomplished by the employment ofcup-shaped dies in a manner well known. In bending the blanks into thedesired cup form it will be advisable to employ a cup-shaped die with avertical spindle projecting from its center. The eye in the centralportion of the plate, having been previously cut, maybe made to embracethe spindle. The follower or male die should be of a form correspondingto the cupdie, but of such lesser dimensions as will admit of thepresence of the metal blank between them when brought into properrelative position. A central recess therein will receive the verticalspindle, and thus each arm will be bent to a uniform degree, and withthe same curve.

The bending of the arms near their ends, for providing a seat for theglobe, may be accomplished simultaneously with the cup-bending,afterward or prior thereto, as may be desired. It is practicable to bendthem in the original blank by dies suited' to the purpose; when so bent,however, it is obvious that the bending-die A must be provided withrecesses iitted to receive them.

In some cases it will be advisable to anneal the blanks prior to thesubsequent bendin gs, 'as these latter will generally render themsufficiently hard to secure a desirable degree of rigidity, and by beingannealed the several bendings may be more easily accomplished It will beobserved that the arms on the lfork side of the blank are apparentlysomewhat shorter than the single arm. In fact, however, all of the armsare of the same length, as will appear from the iigure illustrating ablank, the arms of which have been bent into proper position.

The degree of curve at the bases of the pair of arms in the blank may besomewhat varied, but itis desirable that the proportion of the curve tothe straight line be substantially as shown..

Jointless holders made by this method can readily be distinguished fromthe cast-metal holders by the character of the metal, and can also bedistinguished from holders which might be made by cutting the blank witharms radiating at the outset, from the fact that the straightening orbending of the parallel-armedblank results in a certain peculiar, butunobjectionable, displacement of the metal adjacent to the junction ofthe arms with the central plate, which is readily observable. Thispcculiarity can, of course, be concealed or removed by special working,as with files or hammering, but the additional expense attendant thereonwould render it mainly impracticable so to do.

It will, of course, be mechanically practicable to construct jointlessholders from blanks which, at the outset, have radiating arms, and whichwould not exhibit the peculiarities named, although such holders havenever, to my knowledge, been made; and as the excessive scrapwasteresulting therefrom would render it impracticable when viewed from amercantile point of view it is scarcely probable that such a method willever be adopted to any considerable extent.

Having thus described my invention, I claim as new and desire to secureby Letters Patentl. The method, substantially as described, ofconstructing radialarmed globe-holders, which consists in cutting themin one piece from sheet metal, with the several arms occupying parallellines, and then bending them so as to occupy the requisitevradial lines,as and for the purposes specified.

2. The cutting die, substantially as described, for cutting blanks forradial-armed holders, with which the several arms can be cut on lineswhich are parallel, as and for the purposes specified.

Witnesses: C. HENRY BARNEY,

Nonnrs G. ABBOTT, J. B. FULLER.

